Page 64 - 《水资源与水工程学报》2023年第2期
P. 64
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sinsshowedasignificantlydecreasingtrend,butthemeanannualrunoffdepthoftheYR(69.34mm)
wasgreaterthanthatoftheXJ(39.07mm),whichdecreasedatarateof13.0mm/10aand8.7
mm/10a,respectively;themonthlyandseasonalrunoffdepthalsodecreasedsignificantly,especiallyin
summer.Anabruptchangewasobservedin1981and1979intheXJandYR ,respectively,aftertheab
ruptchangethedecreaserateoftherunoffdepthsloweddown,andthefrequencyofextremerunoffde
creased,withthelargestdeclineofrunoffspottedinAugust.Themainperiodsofrunoffdepthwere15,
8,5aintheXJand16,10,5aintheYR.Additionally,therewerefiveperiodsofdryandwetatthe
timescaleofthefirstprincipalperiod.Theresultsofthecorrelationanalysisandrandomforestmodelin
dicatedthatprecipitationwasthedominantfactoraffectingthelongtermrunoffchanges ,especiallyinthe
floodseason,whereasleafareaindexwasanotherimportantfactoraffectingtherunoffchangesinthenon
floodseason.
Keywords:runoffdepth;random forestmodel;influencingfactor;theXiaojueRiverBasin;theYe
RiverBasin;themountainousHutuoRiverBasin
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